Get Real, Robert
It's all very well to make the fine point that some parts of Antarctica are drier than some parts of Mars, at some times - that is factually true.
But you are guilty of fraudulent misrepresentation to then switch to a very WET bit of Antarctica and try to carry that argument.
ALL of Mars is drier and colder than those bits of Antarctica. ALL the time.
If you make an argument, stick on the same side of it.